Marvin Integrity and Infinity by Marvin were two separate window lines built for two separate markets, and only one of them still carries its original name. Integrity served new construction and was retired as a brand in April 2019, with its products continuing as the Marvin Elevate and Marvin Essential collections. Infinity serves the replacement market, has never been renamed, and is still sold today through its own dealer network. Both are built on the same Ultrex fiberglass. Below we cover where each line came from, how the interiors and warranties differ, how you actually buy each one, how to work out which is already installed in a house, and what to specify on a project now.

What Is the Difference Between Marvin Integrity and Infinity?

The difference between Marvin Integrity and Infinity is the market each was built for and the channel each is sold through. Integrity was a new construction line sold through building material dealers, while Infinity is a replacement line sold and installed through a separate network of Infinity partners. Integrity was retired as a brand name in April 2019. Infinity was not.

Four differences follow from that split. The interiors differ, with Integrity offering real pine or all fiberglass while Infinity offers a woodgrain finish called EverWood or prefinished fiberglass. The warranties differ in structure. The purchase process differs, since one arrives on a takeoff and the other arrives with a measurement appointment. The option sets differ, because Infinity was built for homeowners choosing details and Integrity was built for builders needing fast lead times.

What the two share is the material. Both lines were built around Ultrex, the pultruded fiberglass Marvin developed in the early 1990s, and that shared foundation is why the two get confused so often. Anyone comparing Marvin windows across the two names is looking at the same core material in two different product programs.

Does Marvin Still Make Integrity Windows?

Marvin does not still make Integrity windows under that name, though the products themselves continued without interruption. Marvin retired the Integrity brand on April 30, 2019, moving Integrity Wood-Ultrex into the Elevate Collection and Integrity All-Ultrex into the Essential Collection. The frames, the Ultrex, and the manufacturing all carried straight through the change.

A homeowner with Integrity windows installed in 2015 owns what is now sold as Marvin Elevate or Marvin Essential, depending on which line it was. Parts, glass, and warranty service all run through the current Marvin channel against the original serial number.

Is Infinity by Marvin Still Made?

Infinity by Marvin is still made and still carries its original name. The 2019 brand consolidation applied to the Marvin and Integrity brands, and Infinity was left outside it as a separate replacement business with its own partner network, its own product catalogue, and its own warranty.

That is the cleanest way to hold the two apart. One name survived the 2019 change and one did not, which means any current article describing Integrity as a product you can order today is working from information at least seven years out of date.

What Is Infinity by Marvin?

Infinity by Marvin is Marvin’s replacement window and door brand, built on Ultrex fiberglass and sold through a dedicated network of local partners. Marvin leadership received board approval for Infinity in December 2000, and the first customer order shipped on October 4, 2002, in Chicago. Dan Marvin and Tom Goldsmith developed the business case after identifying an opening in the replacement segment.

The start was modest. The team leased 50,000 square feet at the back of a sugar warehouse in Fargo, North Dakota, and recruited nine people from the Integrity plant. The first prototype was a double hung built from wood and painted white to imitate the look of Ultrex, driven ten hours from Fargo to Chicago in a pickup to be shown to five dealers. Demand grew fast enough that a purpose-built 200,000 square foot facility went up in Fargo in late 2006, and the brand reached partners across 35 states.

Several industry firsts came out of that program:

• First non-wood window brand from Marvin, built entirely on fiberglass rather than on the company’s traditional wood platform.
• First to use united inch sizing and pricing, simplifying how replacement units get quoted.
• First to offer grilles-between-the-glass as a standard option rather than as a special order.
• First fiberglass window with simulated divided lite glass, bringing a traditional look to a fiberglass frame.
• First Marvin product line to carry a limited lifetime warranty, which remains the structure today.

Product range reflects the replacement focus. Infinity reaches larger overall sizes than the new construction fiberglass lines did and offers polygon and arched picture windows, because a replacement project frequently has to match an existing opening rather than a standard rough opening.

What Were Marvin Integrity Windows?

Marvin Integrity windows were a new construction line launched in 1994 as Marvin’s first product family built on Ultrex fiberglass. Integrity was aimed squarely at builders, with a deliberately streamlined option set that supported fast custom lead times. Dealer documentation from the period notes custom orders shipping within ten days of placement, which was the point of limiting the catalogue.

Two lines sat under the Integrity name. Wood-Ultrex paired a natural pine interior with an Ultrex fiberglass exterior. All-Ultrex used Ultrex on both faces. Both were offered across six exterior colors, and both were sold through building material dealers on a project takeoff rather than through a retail consultation.

What Is the Difference Between Wood-Ultrex and All-Ultrex?

The difference between Wood-Ultrex and All-Ultrex is the interior material. Wood-Ultrex gave a real pine interior that could be stained or painted to match the trim in a room. All-Ultrex used Ultrex fiberglass inside, with the interior available in Stone White, which removed the finishing step entirely.

That split maps cleanly onto the current lineup. Wood-Ultrex is now Elevate, with pine interiors available bare, clear coated, painted white, or painted Designer Black. All-Ultrex is now Marvin Essential, still fiberglass inside and out. Builders who specified one or the other before 2019 can order the same construction today under the new name.

Why Did Marvin Build Two Fiberglass Window Lines?

Marvin built two fiberglass lines because new construction and replacement are different businesses with different requirements. A new construction window installs into a framed rough opening on a build schedule, while a replacement window installs into an existing finished opening in an occupied house, and the two situations call for different installation accessories, different sizing tolerances, and different sales processes.

Timeline pressure shaped Integrity. A builder ordering forty openings needs consistent product, predictable lead times, and a manageable number of decisions. Limiting hardware finishes and glass options was how Marvin kept the ten-day custom ship target achievable, and it made Integrity a practical specification for production work. Selecting new construction windows still runs on that same logic today.

Choice mattered more for Infinity. A homeowner replacing eight windows in a house they live in makes each decision personally and is rarely working against a framing schedule, so a broader palette of hardware finishes and decorative glass options fits the buying process. Recognizing the replacement signs that start that conversation usually happens years before an order is placed, which leaves plenty of time to choose details.

Are Integrity and Infinity Made of the Same Material?

Integrity and Infinity are made of the same material. Both lines are built on Ultrex, the proprietary pultruded fiberglass Marvin developed in the early 1990s, and the material specification is identical across them. Ultrex was created first, Integrity launched on it in 1994, and Infinity launched on it in 2002.

Shared material is precisely why the two names get mixed up. Two products from one manufacturer, both fiberglass, both low maintenance, both with factory finishes, differing mainly in who sells them and to whom. Nothing about the frame material separates them.

What Is Ultrex Fiberglass?

Ultrex fiberglass is a pultruded composite made from continuous glass fiber strands cured in thermoset resin. Pultrusion pulls those strands through a resin bath and a heated die that sets the profile in a single pass, leaving the fibers running the full length of the lineal. Marvin measures the result at eight times the strength of vinyl and three times the strength of vinyl and wood composite blends on flexural modulus, with every square inch supporting up to 17 US tons.

Dimensional stability is the property that matters most over time. Ultrex expands roughly 87 percent less than vinyl and at nearly the same rate as the glass it holds, so the frame and the insulating glass unit move together through daily temperature cycling rather than working against each other at the seal. Comparing fiberglass windows against other frame options usually comes down to that single behavior.

Finish durability is specified separately from the frame. The acrylic finish applied over Ultrex measures three times thicker than competing painted finishes, resists fading past 48,000 hours of sunlight exposure, and was the first fenestration finish to earn AAMA 624 verification. How frame materials perform thermally depends on the same low conductivity that makes the material worth specifying in the first place.

How Do the Interiors Differ?

The interiors differ in whether the surface is real wood or a finish applied to fiberglass. Integrity Wood-Ultrex used genuine pine inside, Integrity All-Ultrex used Ultrex fiberglass in Stone White, and Infinity uses either a prefinished fiberglass interior or EverWood, a woodgrain finish applied to fiberglass.

Each approach suits its market. Real pine gives a trim carpenter something to stain alongside the casing and base in a custom home, which is what a new construction buyer often wants. A finished fiberglass interior arrives complete and needs nothing from the crew, which suits a replacement project happening inside a furnished house.

Exterior color palettes overlap heavily. Elevate offers six Ultrex exterior colors: Stone White, Cashmere, Pebble Gray, Bronze, Gunmetal, and Ebony. Infinity offers Stone White, Sierra, Cashmere, Pebble Gray, Bronze, and Ebony. Sierra is specific to Infinity, and Gunmetal is specific to Elevate, so matching exactly across the two programs takes a color check rather than an assumption.

What Is EverWood by Marvin?

EverWood is Infinity’s proprietary woodgrain interior finish, applied to a fiberglass surface rather than being real wood. It can be stained to coordinate with existing woodwork in a home, which is what makes it useful on a replacement project where the surrounding trim already exists and cannot be refinished.

The practical advantage is maintenance. EverWood never needs sanding, scraping, or refinishing the way a wood interior eventually does. Infinity windows are also 100 percent paintable under warranty, so a homeowner who wants a different interior color years later has that option without affecting coverage.

How Do the Warranties Compare?

The warranties compare as a limited lifetime structure against a term-based structure. Infinity carries a fully transferable Limited Lifetime Warranty, while Elevate and Essential carry Marvin’s limited warranty of 20 years on insulating glass seal failure in sizes up to 60 square feet and 10 years on non-glass components, also fully transferable. Both are strong, and the difference reflects how each product reaches the customer rather than a difference in build quality.

Installation is the variable underneath it. Infinity products are installed by the same partner network that sells them, so the manufacturer has visibility into the installation and can underwrite accordingly. Elevate and Essential are supplied to a builder or contractor who installs them, which is why the manufacturer warranty covers the product and the installing contractor warrants the labor separately. Neither model is better; they are matched to different delivery chains.

Line	Market	Name Today	Interior	Warranty Structure	How It Is Sold
Integrity Wood-Ultrex	New construction	Marvin Elevate	Natural pine, four factory finishes	20 years glass, 10 years non-glass, transferable	Building material dealers, on a takeoff
Integrity All-Ultrex	New construction	Marvin Essential	Ultrex fiberglass, Stone White	20 years glass, 10 years non-glass, transferable	Building material dealers, on a takeoff
Infinity by Marvin	Replacement	Infinity by Marvin, unchanged	Prefinished fiberglass or EverWood	Limited Lifetime, transferable	Infinity partner network, sold and installed

Sources: Marvin press announcement dated April 30, 2019; Marvin Window and Door Limited Warranty documentation; Infinity by Marvin brand and warranty materials.

Does the Infinity Warranty Transfer?

The Infinity warranty does transfer to a new owner. Coverage follows the windows rather than the buyer, so a house sold after installation carries the remaining coverage to the new owner. Registering the units and keeping the serial numbers makes a later claim considerably faster to process.

Marvin’s warranty on Elevate and Essential is fully transferable as well. Replacement parts supplied under either warranty inherit the remaining balance of the original term rather than starting a new one.

Where Do You Buy Each One?

You buy Infinity through an Infinity partner and the Marvin collections through a building material dealer. Infinity operates on a dealer-direct model where the same company sells, measures, and installs, while Elevate, Essential, Vivid, and the Signature collections are supplied to builders and contractors who handle their own installation. That difference decides which door a project walks through.

Practically, it means the two products suit different jobs rather than competing for the same one. A homeowner replacing eight windows in a finished house without wanting to hire a separate installer is well served by the Infinity model. A builder framing a new house, or a contractor doing a full-frame replacement as part of a larger remodel, needs product delivered to the jobsite on a schedule with a takeoff behind it.

We supply the Marvin collections rather than Infinity, and we are glad to say so plainly, since sending someone to the right channel is more useful than pretending to be both. Getting the specification right matters either way, and knowing custom windows details like sizing tolerances and glass packages before an order goes in prevents most of the problems that surface later.

How Do I Know If I Have Integrity or Infinity Windows?

You know whether you have Integrity or Infinity windows by finding the serial number and checking a few physical characteristics. Every Marvin and Infinity unit carries an identification number that ties back to the exact configuration that shipped, and the interior material plus the hardware design will usually answer the question even without it. Work through these in order.

1. Locate the serial number. Open the sash and check the top or side edge where it meets the frame, the lower jamb liner on hung units, and the corner of the insulating glass spacer visible through the glass.
2. Check the interior material. Real pine inside indicates Integrity Wood-Ultrex, now Elevate. Fiberglass inside could be either All-Ultrex or Infinity.
3. Look at the interior finish. A woodgrain pattern on a fiberglass surface indicates EverWood, which is specific to Infinity. A plain Stone White fiberglass interior points toward All-Ultrex.
4. Examine the double hung hardware. Infinity double hungs use a single combined lock and tilt latch at the center of the sash. Integrity double hungs used a separate center lock with tilt latches at each side.
5. Consider the installation. An insert unit fitted inside an existing frame, with the original exterior trim untouched, indicates a replacement product. A unit with a nailing fin behind the siding indicates new construction.
6. Check the exterior color. Sierra is offered on Infinity and not on Elevate, so a Sierra exterior is a strong indicator on its own.
7. Call the number in. Any Marvin dealer or Infinity partner can look up a serial number and confirm the line, the build date, and the original glass package.

How Can You Tell If a Window Is Good Quality?

You can tell if a window is good quality by checking the frame material, the finish, the operation, and the published performance ratings. A quality frame holds its shape through temperature change rather than flexing under hand pressure. A quality finish shows even color with no chalking, pinholes, or thin spots at the corners.

Operation reveals a great deal in a few seconds. A well-built sash moves smoothly through its full travel, locks without being forced, and compresses its weatherstrip evenly along the whole length. Performance ratings finish the picture, since NFRC-certified U-factor, solar heat gain coefficient, and air leakage numbers are independently verified rather than being manufacturer claims.

Which Marvin Line Should You Choose Today?

You should choose Elevate or Essential for new construction and full-frame work, Vivid for larger openings, and Infinity for insert replacement through its own network. The decision follows the type of project rather than a ranking, since these products were designed for different applications and all of them are built to the same material standard. Central Oregon builders specifying fiberglass for a new build are choosing among the Marvin collections, not between Marvin and Infinity.

Elevate suits custom homes where a wood interior will be stained or painted with the rest of the trim. Essential suits production builds, multi-unit work, and secondary openings where a finished fiberglass interior saves a step. Marvin Vivid, introduced in 2025 and available in Oregon in its first release wave, pairs an Ultrex exterior with a fiberglass reinforced composite interior, reaches heights up to 10 feet, and certifies to performance grades up to PG50.

Glass specification is a separate decision from the frame and often the more consequential one. Marvin Vivid meets or exceeds ENERGY STAR Version 7.0 across the country, and the other Marvin collections offer glass packages that reach the same thresholds. Sorting the frame line and the glass package as two separate questions produces better outcomes than treating them as one.

Climate exposure in Bend argues for frame stability regardless of which line a project lands on. Wide daily temperature swings load window assemblies twice a day rather than seasonally, which is why cold climate windows get specified around material behavior first and appearance second.

Are Marvin Infinity Windows Good Quality?

Marvin Infinity windows are good quality. They are built from the same Ultrex fiberglass used across Marvin’s fiberglass collections, carry the same acrylic finish specification with AAMA 624 verification, and are backed by a fully transferable limited lifetime warranty.

Installation is included in the value, which matters. Infinity partners are trained on the product they sell, so the measurement, the fit, and the sealing are handled by people who work with the same units daily. On a replacement project, that consistency contributes as much to the result as the window itself does.

Frequently Asked Questions

What Is the Difference Between Marvin and Infinity by Marvin?

The difference between Marvin and Infinity by Marvin is that Marvin covers the made-to-order window and door collections sold through building material dealers, while Infinity by Marvin is a separate replacement brand sold and installed through its own partner network. Both are owned and manufactured by the same company, which has been family owned since 1912.

What Happened to Marvin’s Integrity Windows?

Marvin’s Integrity windows were folded into the Marvin brand on April 30, 2019. Integrity Wood-Ultrex became the Elevate Collection and Integrity All-Ultrex became the Essential Collection, with the products themselves continuing in production unchanged. Only the brand name was retired.

Can Builders Buy Infinity Windows?

Builders can buy Infinity windows through an Infinity partner, and the partner handles the installation as part of the arrangement. Builders working on new construction more commonly specify the Marvin collections instead, since those ship to the jobsite on a takeoff and install with the framing crew already on site.

Is Infinity a Replacement Window Only?

Infinity is built primarily as a replacement product, with installation methods and accessories designed for fitting into existing openings. The partner network is organized around that work as well, from in-home measurement through installation, which is what makes the model suited to occupied houses.

How Long Do Infinity Windows Last?

Infinity windows last 30 to 50 years with proper installation and routine maintenance, in line with other pultruded fiberglass products. The frame material resists the expansion and contraction cycling that shortens the life of less stable materials, and the insulating glass unit inside typically runs a shorter clock than the frame around it.

Can You Match New Marvin Windows to Existing Integrity Windows?

You can match new Marvin windows to existing Integrity windows in most cases, because Elevate and Essential are the same products under later names. Exterior color availability has shifted since 2019, so confirming the original color against the current palette before ordering is worth the extra step. The original serial number is what makes an exact match possible.

Are Infinity and Essential the Same Window?

Infinity and Essential are not the same window, though both use Ultrex fiberglass inside and out. Essential is the new construction collection that came from Integrity All-Ultrex and is sold through building material dealers. Infinity is a separate replacement brand with its own sizing, its own hardware and glass options, its own warranty, and its own sales network. Checking the U-factor on the specific unit is the reliable way to compare thermal performance between them.

The Short Version

Integrity and Infinity were never the same product. Integrity launched in 1994 as a new construction line, was retired as a brand name in April 2019, and lives on as the Elevate and Essential collections. Infinity launched in 2002 as a replacement line, has never been renamed, and is still sold and installed through its own partner network. Both are built on Ultrex fiberglass, which is why the two names have been confused for two decades, and the real differences sit in the interiors, the warranties, the option sets, and the way each product reaches a house.

For a new build or a full-frame remodel, the current answer is Elevate, Essential, Vivid, or one of the Signature collections, chosen by interior material and opening size. For insert replacement in a finished house, Infinity and its partner network is the path. We supply the Marvin collections to builders and homeowners across Central Oregon every week, from spec review through jobsite delivery, and we are always happy to help sort out what a project actually needs. Talk to Lifetime Building Supply at 541-395-6808 anytime.

If you already have a window schedule drawn up, you can request a quote and we will work through the line and glass package with you.